Mark 15:32
Let this Messiah, this king of Israel, come down now from the cross, so that we may see and believe. Those crucified with him also heaped insults on him — the condition for belief offered by the chief priests — come down from the cross and we'll believe — is the demand for a sign on the questioners' terms (Mark 8:11–12 refused). The cross is the sign they have been given; they refuse it. Both crucified criminals mock him according to Mark; Luke 23:39–43 distinguishes the penitent from the impenitent thief.